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Optical processor for an artificial neural network

an artificial neural network and optical processor technology, applied in the field of optical processing units, can solve the problem of emulating ann to have a relatively slow processing speed, and achieve the effect of increasing the processing speed

Inactive Publication Date: 2009-03-31
ALCATEL-LUCENT USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach significantly increases processing speed by performing layer-by-layer signal propagation in ANNs, outpacing neuron-by-neuron processing of computer-emulated ANNs.

Problems solved by technology

Disadvantageously, this serial processing causes the emulated ANN to have a relatively slow processing speed.

Method used

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  • Optical processor for an artificial neural network
  • Optical processor for an artificial neural network
  • Optical processor for an artificial neural network

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Embodiment Construction

Optical Processor

[0023]FIGS. 3A-B schematically show an optical processor 300 that can be used to emulate an artificial neural network (ANN) having two or more artificial neurons according to one embodiment of the invention. More specifically, FIG. 3A shows a side view of processor 300, and FIG. 3B shows a front view of a spatial light modulator (SLM) 330 used in processor 300. In this subsection, only the basic functions of hardware elements of processor 300 are described. Subsequent subsections describe in more detail how processor 300 can be configured to emulate a particular ANN.

[0024]Processor 300 has a laser 310 configured to generate a beam of pulsed light, which, after being collimated by a lens 320, impinges upon SLM 330. Laser 310 is pulsed at a processing rate of processor 300, which is determined by (i) the transit time of light between the laser and a two-dimensional photodetector array 350 and (ii) the response time of the electronic circuits in the photodetector array...

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Abstract

An optical processor adapted to emulate an artificial neural network (ANN) having a plurality of interconnected layers, each layer having one or more artificial neurons, the processor having a spatial light modulator (SLM) optically coupled, via an optical mask, to a photodetector array. In one embodiment, the SLM has a plurality of pixels, each pixel being configurable to emulate an output portion of a corresponding artificial neuron in a signal-sending ANN layer. The optical mask has a hologram that encodes the weights corresponding to interlayer connections in the ANN and spatially modulates the light transmitted by the SLM. The photodetectors of the array spatially resolve the interference pattern produced by the spatially modulated light, with each photodetector being configurable to emulate an input portion of a corresponding artificial neuron in a signal-receiving ANN layer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to artificial neural networks and, more specifically, to an optical processing unit that can be used to emulate such networks.[0003]2. Description of the Related Art[0004]An artificial neural network (ANN) is an information processing paradigm that is inspired by the way biological nerve systems, such as the brain, process information. An information processing system based on this paradigm can be composed of a large number of interconnected processing elements (artificial neurons) working together to solve specific problems. Similar to people, ANNs can learn by example. As such, an ANN can be configured for a specific application, e.g., pattern recognition or data classification, through a learning process, which involves appropriate adjustments of synaptic connections between different neurons and / or decision making in the neuron core.[0005]FIG. 1 schematically shows a simple artificial n...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06E1/00G06E3/00G06F15/18G06G7/00G06N3/02
CPCG06N3/067
Inventor MARTINEZ, JOHN C.
Owner ALCATEL-LUCENT USA INC
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